yes I have observed hens laying better eggs after being ill/having issues, though not impacted crop as such.
Venka, my oldest Swedish Flower, laid soft shelled eggs more often than properly shelled ones for her entire first season, even the 'proper ones' were thin-shelled, and at one point I considered culling her because so many were getting split in the coop or outside (sometimes she laid them as if pooping; I think it felt to her like that's what was happening) I feared the flock would develop the habit of egg eating, which I'd read was a Very Bad Thing to be avoided at all costs. She was the only one having this issue so I decided it was idiopathic, and she's a very nice hen, so I didn't cull her and determined to tackle the issue of egg eating if and when it happened. It didn't, and from the start of the next laying season her eggs were absolutely fine, and have been even since. I have no idea why it took her system so long to get into gear, or what she was being challenged with if she was ill, and none of her daughters have had any issues with the quality of their eggs. And I am so glad I did not cull her, because she's become a star in the flock- and still laying a few eggs a week since January even though she's 6 now!
and Turkey 
. Is that what you mean, or am I reading it completely wrong
I think one is male and the other female but I've been wrong before.
